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Series A.—Mathematical and Physical. 
On the Intensity and Direction of the Force of Gravity in India, By Lieut.-Colonel 
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On the Refractive Index of Gaseous Fluorine. By C. Cuthbertson and E. B. R. Prideaux, 
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Modified Apparatus for the Measurement of Colour and its Application to the Determination of 
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The Pressure of Explosions.—Experiments on Solid and Gaseous Explosives. Parts I. and II. 
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Fifth and Sixth Catalogues of the Comparative Brightness of the Stars—in Continuation of 
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Dr. Herschel, LL.D., F.R.S., Prepared for Press from the Original MS. Records by 
Col. J. Herschel, R.E., F.R.S. Pp. 49. Price 2s. 
On the Accurate Measurement of Ionic Velocities, with Applications to Various Ions. By 
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On Mathematical Concepts of the Material World. By A. N. Whitehead, Sc.D., F.R.S., 
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Title, Contents, Index, &c., Vol. 205. Pp. 10. Price 6 d. 
The Combination of Hydrogen and Oxygen in Contact with Hot Surfaces. By IVilliam 
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Manchester, and Fellow of Victoria University, and Richard Vernon Wheeler, B.Sc., 
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On the Periodicities of Sunspots. By Arthur Schuster, F.R.S. Pp. 32. Price Is. Qd. 
Ionic Size in Relation to the Physical Properties of Aqueous Solutions. By W. R. Bousfield, 
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On Endophytic Adaptation shown by Erysipha graminis DC. under Cultural Conditions. By 
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Contributions to the Physiology of Mammalian Reproduction.—Part I. The (Estrous Cycle in 
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The Morphology of the Ungulate Placenta, particularly the Development of that Organ in the 
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Further Experiments and Histological Investigations on Intumescences, with some Observations 
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Some Observations on TFeliritschia mirabilis , Hooker, /. By H. H. W. Pearson, M.A., F.L.S., 
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The Araucariete, Recent and Extinct. By A. C. Seward, F.R.S., Fellow of Emmanuel College, 
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